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Highest advisory severityHigh 2 vendors · 2 advisories

CVE-2026-115448

Uncontrolled recursion in Apache ZooKeeper

CVE-2026-115448: Uncontrolled recursion in Apache ZooKeeper. Not in the CISA KEV catalog. High advisory severity (CVSS 8.7, Apache).

Compare the source-linked records below. Ratings and product/version details belong to each advisory; they are not a single CVE-wide score or proof that every listed product is affected. How VulniPulse collects and checks evidence.

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CVE-2026-115448 key facts

CISA KEV
Not listed (catalog checked )
Highest advisory severity
High
CVSS base score
8.7 (Apache), 7.5 (Red Hat)
Weakness
CWE-770
Fixed releases
  • Apache: 3.8.8, 3.9.7
Vendor advisories
2 from Apache, Red Hat
VulniPulse record
Published · Updated

Scores, vectors, weaknesses and fixed releases are quoted from vendor advisories that cover only CVE-2026-115448; bulletin-wide values are not repeated here.

Is CVE-2026-115448 exploited?

No exploitation is reported in the sources VulniPulse tracks: CVE-2026-115448 is not in the CISA KEV catalog (checked ) and no tracked advisory for it reports exploitation. That is not proof the vulnerability cannot be exploited.

How do I fix CVE-2026-115448?

Upgrade to a fixed release named by the vendor:

  • Apache: 3.8.8, 3.9.7
  • Users are recommended to upgrade to 3.8.8 or 3.9.7, which fix the issue. (Apache)
  • Restrict network exposure and enforce strict authentication and Access Control Lists (ACLs) on ZooKeeper instances: 1. Network Isolation: Limit access to ZooKeeper service ports (such as TCP port 2181) strictly to trusted application infrastructure using firewalld: ``` firewall-cmd --zone=trusted --add-source= --permanent firewall-cmd --permanent --remove-port=2181/tcp firewall-cmd --reload ``` 2. Access Control Configuration: Configure authentication (such as SASL or digest) and replace the default open root ACL to revoke unauthenticated creation rights on the root path using the administrative client: ``` setAcl / auth: : :cdwra ``` Caveats: Applying strict ACLs and restricting network ports will block clients that rely on anonymous or unauthenticated connections until valid credentials are provided. Warning: Reloading firewall rules or modifying ZooKeeper configuration parameters may cause transient service interruptions or require restarting dependent cluster components. (Red Hat)

Vendor advisory comparison

Apache

1 advisory
  • Advisory severityHigh8.7

    High [CVE-2026-115448] Uncontrolled recursion in Apache ZooKeeper

    CVE-2026-115448Source published Source updated

    Uncontrolled recursion in Apache ZooKeeper. The server serializes its data tree to a snapshot by recursing one stack frame per znode level, with no depth bound. A client permitted to create znodes (the default root ACL is open) can build a chain of nested znodes deep enough that taking a snapshot exhausts the JVM stack and kills the snapshot thread; sizes stay within jute.maxbuffer, so existing limits do not prevent it. This is a denial of service that becomes persistent: on restart the server rebuilds the deep tree from its transaction log and fails again while taking the startup snapshot, so it does not return to service, and recovery can entail data loss. The same log affects a leader and its followers, so it can spread across an ensemble. This issue affects Apache ZooKeeper 3.8.0…

    Affected products in this advisory
    • Apache ZooKeeper
    Source-reported affected versions
    • through 3.8.7
    • through 3.9.6
    Source-reported fixed versions
    • 3.8.8
    • 3.9.7
    Mitigation guidance
    • Users are recommended to upgrade to 3.8.8 or 3.9.7, which fix the issue.
    Workarounds
    • As a workaround, use ACLs and authentication to restrict znode creation rather than relying on the default open root ACL.
    Full advisory and evidenceOpen source bulletin

Red Hat

1 advisory
  • Advisory severityHigh7.5

    High [CVE-2026-115448] Denial of Service via deeply nested znodes during snapshot creation

    CVE-2026-115448Source published Source updated

    Denial of Service via deeply nested znodes during snapshot creation. Red Hat rates this important (CVSS 7.5). Weakness: CWE-770. Affected products named by the advisory: Red Hat AMQ Broker 7; Red Hat Fuse 7; Red Hat Offline Knowledge Portal; Red Hat OpenShift AI (RHOAI).

    Related products — impact not confirmed
    • Red Hat AMQ Broker 7
    • Red Hat Fuse 7
    • Red Hat Offline Knowledge Portal
    • Red Hat OpenShift AI (RHOAI)
    Source-reported affected versions
    Affected-version details not available in this record.
    Source-reported fixed versions
    No fixed-version detail extracted. This does not mean no fix exists.
    Mitigation guidance
    • Restrict network exposure and enforce strict authentication and Access Control Lists (ACLs) on ZooKeeper instances: 1. Network Isolation: Limit access to ZooKeeper service ports (such as TCP port 2181) strictly to trusted application infrastructure using firewalld: ``` firewall-cmd --zone=trusted --add-source=<trusted-client-ip> --permanent firewall-cmd --permanent --remove-port=2181/tcp firewall-cmd --reload ``` 2. Access Control Configuration: Configure authentication (such as SASL or digest) and replace the default open root ACL to revoke unauthenticated creation rights on the root path using the administrative client: ``` setAcl / auth:<user>:<password>:cdwra ``` Caveats: Applying strict ACLs and restricting network ports will block clients that rely on anonymous or unauthenticated connections until valid credentials are provided. Warning: Reloading firewall rules or modifying ZooKeeper configuration parameters may cause transient service interruptions or require restarting dependent cluster components.
    Full advisory and evidenceOpen source bulletin

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